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This chapter explores how the EU ended a long period of constitutional change by agreeing the Treaty of Lisbon and used it to face new challenges of financial crisis, Brexit, and Covid-19—the latter events leading to thoughts that further treaty change might be needed. The process started with the 2002–03 Convention on the Future of Europe leadin to the Constitutional Treaty of 2004 and in October 2007 produced the Treaty of Lisbon which eventually entered into force on 1 December 2009. Its implementation was complicated by the eurozone crisis, resulting in extra-treaty arrangements and another treaty amendment. Although the official appetite for treaty reform all but evaporated in the 2010s, the UK’s June 2016 vote to quit the EU raised the hopes for further changes. The end of the 2010s and into the 2020s saw Brexit being negotiated within the terms of the Treaty of European Union the EU’s treaty agreeing measures to deal with the Covid-19 pandemic. Calls for treaty revision continued but active steps to re-negotiate the consolidated treaties have not yet begun.

This chapter examines two important developments in the history of the European Union (EU): the signing of the Maastricht and Amsterdam Treaties. In June 1989, the European Council agreed to European Commission President Jacques Delors’s three-stage plan for monetary union by 1999, despite British opposition. In 1991, intergovernmental conferences (IGCs) were held on both monetary union and political union. The proposals of these IGCs were incorporated into the Treaty on European Union (TEU), agreed at Maastricht in December 1991. The TEU marked a major step on the road to European integration. It committed most of the member states to adopting a single currency and introduced the concept of European citizenship, among others. This chapter considers the events leading up to the signing of the TEU, from the Maastricht negotiations to the issue of enlargement, the 1996 IGC, and the Treaty of Amsterdam.

This chapter explores the emergence and implementation of the Treaty of Lisbon. Its origins lie in the Constitutional Treaty of 2004 and its rejection in the French and Dutch referendums of 2005, which led to a period of so-called reflection. Then, mainly under the German Council presidency of early 2007, there was an emphatic drive to produce not a constitution, but an orthodox amending treaty to carry forward the basic reforms of the Constitutional Treaty. A deal was reached in October 2007. However, while parliamentary ratification went successfully, an initial referendum rejection in Ireland in June 2008 cast doubt on the new Treaty’s future. In part, this symbolized a rejection of some elements of the Treaty, but it also owed much to a deeper unease about the EU. Once Irish concerns had been assuaged, a second referendum produced the necessary ‘yes’ to ratification and, following some last-minute concessions to the Czech Republic, the Treaty of Lisbon entered into force on 1 December 2009. Its implementation proceeded relatively smoothly but was complicated by the eurozone crisis, which in turn pushed the EU to pursue some further treaty reform. In the face of increasing Euroscepticism, and persistent question marks over the popular legitimacy of the EU, the appetite for treaty reform all but evaporated for much of the 2010s, even if for integrationists the eurozone crisis demanded further reform. Towards the end of the decade, with Emmanuel Macron as French President calling for a ‘re-founding’ of the EU and the UK negotiating its withdrawal from the EU, opportunities for and some interest in a new round of treaty reform appeared to be emerging.